Trying to Understand...

I'm interested in understanding what  alcoholism is. 

• When does the addiction begin? (childhood?)
• What is usually the basis for alcohol addiction?  (Depression? Low esteem? Abuse?)
• Is it possible that alcoholism is genetic, as in is there a gene for the addiction? 
• If it is genetic, then how can one break the addiction?
• Is there damage control?  For ex., can one consume foods and herbs that heal the liver while still drinking?

Thank you in advance for offering your thoughts on these questions.